A Canadian judge handed protesters of the G20 summit in Toronto a small victory on
Friday, restricting the use of a controversial sound cannon for crowd control.

Toronto police agreed to amend their guidelines for use of the cannon,
keeping volumes below the maximum and not using the device from close
distances.

The portable loudspeakers
are also known as sonic guns because the volume, specifically on the
"alert" function
that emits an ear-piercing beeping sound, can be turned up so high they
can be used as weapons.

"I have concluded that a very real likelihood exists that demonstrators
may suffer damage to their hearing from the proposed use of the Alert
function at certain distances and volumes," Ontario Superior Court Justice David Brown
wrote in his ruling.

The Canadian Civil
Liberties Association and the Canadian Labour Congress had sought an
injunction curbing police
use of the cannon, and their lawyer, Paul Cavalluzzo, said Toronto
police "went overboard."

"What this application shows ... is that the police are accountable to the citizens
of Toronto, that
police are there to serve and protect us, not to endanger our safety,"
he said.

Police said they hoped they would never have to use the device. "We'll
use the alert if necessary in accordance with the guidance by the
court," police Staff Superintendent Jeff McGuire said. "We would hope
not to have to use it and quite frankly I'd be surprised if we do."

Canada is spending
about C$1 billion
on security for two international summits this week, with much of that going
to control thousands of protesters who are using the events to push
demands to end global poverty and address climate change.

On Friday and Saturday, leaders from the Group of Eight industrialized
nations are meeting in Huntsville,
Ontario, about two hours' drive north of Toronto. The Group of
20 nations will then gather in Toronto on Saturday and Sunday.